1 /* 2 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* zutil.c -- target dependent utility functions for the compression library 7 * Copyright (C) 1995-2005 Jean-loup Gailly. 8 * For conditions of distribution and use, see copyright notice in zlib.h 9 */ 10 11 #pragma ident "%Z%%M% %I% %E% SMI" 12 13 #include "zutil.h" 14 15 #ifndef NO_DUMMY_DECL 16 struct internal_state {int dummy;}; /* for buggy compilers */ 17 #endif 18 19 const char * const z_errmsg[10] = { 20 "need dictionary", /* Z_NEED_DICT 2 */ 21 "stream end", /* Z_STREAM_END 1 */ 22 "", /* Z_OK 0 */ 23 "file error", /* Z_ERRNO (-1) */ 24 "stream error", /* Z_STREAM_ERROR (-2) */ 25 "data error", /* Z_DATA_ERROR (-3) */ 26 "insufficient memory", /* Z_MEM_ERROR (-4) */ 27 "buffer error", /* Z_BUF_ERROR (-5) */ 28 "incompatible version",/* Z_VERSION_ERROR (-6) */ 29 ""}; 30 31 32 const char * ZEXPORT zlibVersion() 33 { 34 return ZLIB_VERSION; 35 } 36 37 uLong ZEXPORT zlibCompileFlags() 38 { 39 uLong flags; 40 41 flags = 0; 42 switch (sizeof(uInt)) { 43 case 2: break; 44 case 4: flags += 1; break; 45 case 8: flags += 2; break; 46 default: flags += 3; 47 } 48 switch (sizeof(uLong)) { 49 case 2: break; 50 case 4: flags += 1 << 2; break; 51 case 8: flags += 2 << 2; break; 52 default: flags += 3 << 2; 53 } 54 switch (sizeof(voidpf)) { 55 case 2: break; 56 case 4: flags += 1 << 4; break; 57 case 8: flags += 2 << 4; break; 58 default: flags += 3 << 4; 59 } 60 switch (sizeof(z_off_t)) { 61 case 2: break; 62 case 4: flags += 1 << 6; break; 63 case 8: flags += 2 << 6; break; 64 default: flags += 3 << 6; 65 } 66 #ifdef DEBUG 67 flags += 1 << 8; 68 #endif 69 #if defined(ASMV) || defined(ASMINF) 70 flags += 1 << 9; 71 #endif 72 #ifdef ZLIB_WINAPI 73 flags += 1 << 10; 74 #endif 75 #ifdef BUILDFIXED 76 flags += 1 << 12; 77 #endif 78 #ifdef DYNAMIC_CRC_TABLE 79 flags += 1 << 13; 80 #endif 81 #ifdef NO_GZCOMPRESS 82 flags += 1L << 16; 83 #endif 84 #ifdef NO_GZIP 85 flags += 1L << 17; 86 #endif 87 #ifdef PKZIP_BUG_WORKAROUND 88 flags += 1L << 20; 89 #endif 90 #ifdef FASTEST 91 flags += 1L << 21; 92 #endif 93 #ifdef STDC 94 # ifdef NO_vsnprintf 95 flags += 1L << 25; 96 # ifdef HAS_vsprintf_void 97 flags += 1L << 26; 98 # endif 99 # else 100 # ifdef HAS_vsnprintf_void 101 flags += 1L << 26; 102 # endif 103 # endif 104 #else 105 flags += 1L << 24; 106 # ifdef NO_snprintf 107 flags += 1L << 25; 108 # ifdef HAS_sprintf_void 109 flags += 1L << 26; 110 # endif 111 # else 112 # ifdef HAS_snprintf_void 113 flags += 1L << 26; 114 # endif 115 # endif 116 #endif 117 return flags; 118 } 119 120 #ifdef DEBUG 121 122 # ifndef verbose 123 # define verbose 0 124 # endif 125 int z_verbose = verbose; 126 127 void z_error (m) 128 char *m; 129 { 130 fprintf(stderr, "%s\n", m); 131 exit(1); 132 } 133 #endif 134 135 /* exported to allow conversion of error code to string for compress() and 136 * uncompress() 137 */ 138 const char * ZEXPORT zError(err) 139 int err; 140 { 141 return ERR_MSG(err); 142 } 143 144 #if defined(_WIN32_WCE) 145 /* The Microsoft C Run-Time Library for Windows CE doesn't have 146 * errno. We define it as a global variable to simplify porting. 147 * Its value is always 0 and should not be used. 148 */ 149 int errno = 0; 150 #endif 151 152 #define HAVE_MEMCPY 153 #ifndef HAVE_MEMCPY 154 155 void zmemcpy(dest, source, len) 156 Bytef* dest; 157 const Bytef* source; 158 uInt len; 159 { 160 if (len == 0) return; 161 do { 162 *dest++ = *source++; /* ??? to be unrolled */ 163 } while (--len != 0); 164 } 165 166 int zmemcmp(s1, s2, len) 167 const Bytef* s1; 168 const Bytef* s2; 169 uInt len; 170 { 171 uInt j; 172 173 for (j = 0; j < len; j++) { 174 if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1; 175 } 176 return 0; 177 } 178 179 void zmemzero(dest, len) 180 Bytef* dest; 181 uInt len; 182 { 183 if (len == 0) return; 184 do { 185 *dest++ = 0; /* ??? to be unrolled */ 186 } while (--len != 0); 187 } 188 #endif 189 190 191 #ifdef SYS16BIT 192 193 #ifdef __TURBOC__ 194 /* Turbo C in 16-bit mode */ 195 196 # define MY_ZCALLOC 197 198 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes 199 * and farmalloc(64K) returns a pointer with an offset of 8, so we 200 * must fix the pointer. Warning: the pointer must be put back to its 201 * original form in order to free it, use zcfree(). 202 */ 203 204 #define MAX_PTR 10 205 /* 10*64K = 640K */ 206 207 local int next_ptr = 0; 208 209 typedef struct ptr_table_s { 210 voidpf org_ptr; 211 voidpf new_ptr; 212 } ptr_table; 213 214 local ptr_table table[MAX_PTR]; 215 /* This table is used to remember the original form of pointers 216 * to large buffers (64K). Such pointers are normalized with a zero offset. 217 * Since MSDOS is not a preemptive multitasking OS, this table is not 218 * protected from concurrent access. This hack doesn't work anyway on 219 * a protected system like OS/2. Use Microsoft C instead. 220 */ 221 222 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) 223 { 224 voidpf buf = opaque; /* just to make some compilers happy */ 225 ulg bsize = (ulg)items*size; 226 227 /* If we allocate less than 65520 bytes, we assume that farmalloc 228 * will return a usable pointer which doesn't have to be normalized. 229 */ 230 if (bsize < 65520L) { 231 buf = farmalloc(bsize); 232 if (*(ush*)&buf != 0) return buf; 233 } else { 234 buf = farmalloc(bsize + 16L); 235 } 236 if (buf == NULL || next_ptr >= MAX_PTR) return NULL; 237 table[next_ptr].org_ptr = buf; 238 239 /* Normalize the pointer to seg:0 */ 240 *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4; 241 *(ush*)&buf = 0; 242 table[next_ptr++].new_ptr = buf; 243 return buf; 244 } 245 246 void zcfree (voidpf opaque, voidpf ptr) 247 { 248 int n; 249 if (*(ush*)&ptr != 0) { /* object < 64K */ 250 farfree(ptr); 251 return; 252 } 253 /* Find the original pointer */ 254 for (n = 0; n < next_ptr; n++) { 255 if (ptr != table[n].new_ptr) continue; 256 257 farfree(table[n].org_ptr); 258 while (++n < next_ptr) { 259 table[n-1] = table[n]; 260 } 261 next_ptr--; 262 return; 263 } 264 ptr = opaque; /* just to make some compilers happy */ 265 Assert(0, "zcfree: ptr not found"); 266 } 267 268 #endif /* __TURBOC__ */ 269 270 271 #ifdef M_I86 272 /* Microsoft C in 16-bit mode */ 273 274 # define MY_ZCALLOC 275 276 #if (!defined(_MSC_VER) || (_MSC_VER <= 600)) 277 # define _halloc halloc 278 # define _hfree hfree 279 #endif 280 281 voidpf zcalloc (voidpf opaque, unsigned items, unsigned size) 282 { 283 if (opaque) opaque = 0; /* to make compiler happy */ 284 return _halloc((long)items, size); 285 } 286 287 void zcfree (voidpf opaque, voidpf ptr) 288 { 289 if (opaque) opaque = 0; /* to make compiler happy */ 290 _hfree(ptr); 291 } 292 293 #endif /* M_I86 */ 294 295 #endif /* SYS16BIT */ 296 297 298 #ifndef MY_ZCALLOC /* Any system without a special alloc function */ 299 300 #ifndef STDC 301 extern voidp malloc OF((uInt size)); 302 extern voidp calloc OF((uInt items, uInt size)); 303 extern void free OF((voidpf ptr)); 304 #endif 305 306 voidpf zcalloc (opaque, items, size) 307 voidpf opaque; 308 unsigned items; 309 unsigned size; 310 { 311 if (opaque) items += size - size; /* make compiler happy */ 312 return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) : 313 (voidpf)calloc(items, size); 314 } 315 316 void zcfree (opaque, ptr) 317 voidpf opaque; 318 voidpf ptr; 319 { 320 free(ptr); 321 if (opaque) return; /* make compiler happy */ 322 } 323 324 #endif /* MY_ZCALLOC */ 325